Malicious PDF — malware analysis report

Static analysis result for SHA-256 936dc1387440585c…

MALICIOUS

PDF

82.5 KB Created: 2021-03-29 23:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 38487d2cb574ac6b6a5068c5477424d9 SHA-1: 848bb9adc7b9786245cc8125158bd33a41a09331 SHA-256: 936dc1387440585c136cbf42d8f5633742805992d78d412ab8999765c0e55b2b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crophysi.ru/123?utm_term=free+full+games++my+talking+angela PDF link annotation
    • https://zetidepip.weebly.com/uploads/1/3/4/4/134432407/93da9039.pdfIn PDF document text
    • https://fumamefix.weebly.com/uploads/1/3/0/8/130873833/tinofokikazixu.pdfIn PDF document text
    • https://bobefadapuxat.weebly.com/uploads/1/3/4/8/134858353/e2b2026e1f04.pdfIn PDF document text
    • https://safusugefivelu.weebly.com/uploads/1/3/4/3/134346528/8366082.pdfIn PDF document text
    • https://lutaxebibutemun.weebly.com/uploads/1/3/1/3/131380730/dumidupudagupaw_vawala.pdfIn PDF document text
    • https://nokatumevizo.weebly.com/uploads/1/3/2/7/132740479/duzanijopogipaba.pdfIn PDF document text
    • https://gojafone.weebly.com/uploads/1/3/4/8/134891791/3133783e3.pdfIn PDF document text
    • https://bixemasabomevis.weebly.com/uploads/1/3/4/5/134517571/jamomave.pdfIn PDF document text
    • https://norofuzalugegok.weebly.com/uploads/1/3/4/8/134882219/8659099.pdfIn PDF document text
    • https://cdn.sqhk.co/pumevigatare/7yTia0e/blue_color_code_in_android_studio.pdfIn PDF document text
    • https://bovitala.weebly.com/uploads/1/3/4/4/134497817/penubunego.pdfIn PDF document text
    • https://tevoletefe.weebly.com/uploads/1/3/1/6/131606261/188d3558f3b19.pdfIn PDF document text
    • https://cdn.sqhk.co/sesexibanobu/hejaIgf/siriusxm_music_podcasts_radio_news_more.pdfIn PDF document text
    • https://fuxijisolano.weebly.com/uploads/1/3/5/3/135348953/wurevofeb.pdfIn PDF document text
    • https://cdn.sqhk.co/mamuxejoxe/iecif3T/balochistan_board_ba_date_sheet_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/wukibezoso/Lojjhgh/20509991102.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C5 4980 bytes
SHA-256: ef2722ef91498d0ef8cb0cf8cd2f8c837d408088e6533a009ac85542bd8d1431
font_01_sfnt_off00010aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA4 10616 bytes
SHA-256: 1da1386eb205b3f51928aa07baca7bd586b74bfcf08bc0987506488abc4c2326
font_02_sfnt_off00012f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0E 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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